Telemeter or range-finder.



- i A. TAYLOR a. P. w. GRAY; v T ELEMEIER on RANGE mma. APFLICATIOIFILED NOV. 6.-*l9lb. .'1

Patentedk @ti-521918.' l

unters-#suur g Wlgasses A. TAYLOR a P. w. GRAY. y

. TELENETER 0R RANGE HNDER.

mamon mtu nov, s. |915.

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' 'Patented 'on'15.1918.

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A. TAYLOR a P. w. GRAY. manana on mme moz-a.

' nrucmox msu RDV. i. i915.

v Patented 0ct15,1918.

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n .muuv-...Y .......nnl r STATES PATENT, @einen y TAYLOR AND mc? WILLIE.GRAY, 0F YORK, EIGIJAND.

To i" th subjects of the King` of Great Britain, et York, in

the county of York in the Kingdom of Englend, have inven certain new anduseful Improvements in Telemeters or Range-Findeis, of which thefollowing is n specicstion.

The pr-ent invention relates to improve ments in telemeters, rangefinders and the like instruments.

According to the present invention means are provided whereby correctionmay be made from the range of a sighted point a certain distancevertically above the earth automatically to n horizontal range, that isto the horizontal the distance rom the range finder to e spot verticallybelow the observed object.

Such correction means are of particular utility in connection with rangefinders adapted for finding the range of aeroplanes or of other objectsgenerally situated above the earth. l

In the use of such range iindersit will he perceived that lthere are twoproblems to he solved, first given a fixed base such as the width orheight of a distantobject, then by means of therange finder it ispossible to ascertain the distance of the object. Then secondly, it isusually desirable to correct this veluel to obtain the horizontal rangeby" multipl ing this reading b the co-sine of the ang e subtended by theohjeot to the horizon'tal.

By means of the prent invention an apparatus may be constructed whichwill directly solve by e single reading such a dual problem.

As a. means. for correction e. cam cut in a oo-sine curve is used sothat, as-the telescope of the rangs nder is inclined tovsight en objectout of the horizontal, so is the cam moved to adjust the relativeposition of the mange dial and index. For instance, the index may he s.movable one and have its position solely controlled by the positionosaidco-sinecnm.

The present invention is -more particularly described withreerence tothe eccompenying in whichz-- Lirigure i is s eide elevation of one formof instrument.

03 RANGE-mm i Patented oet. 15, 191e;

spammen of um hun.: f ppln alud Incubo: A, 1315. loria! 3e. $6,019.-

Fig. 2in an end view coi'reepo.ridingy to Figxl.A c

13.3 1s a plan view corresponding to 1 showing range finder parts andscale, w

.Fig 4 is n plan view corresponding to F1g. 2 but showing the operatingmeans for obtaining the correction with certain parte removed.

Fig. 5 is a diagrammatic view.

The invention will be particularly described with reference to' a.divided object glass type of range nder, but it will be obvious that theimprovements are generally applicehle to other types such as those ofswinging prisms or mirrors. The telescope l is provided with a dividedobgect glass consisting' ofV e. fixed por# tion 2 and a movable portion3 which latter is directly connected or linked to env operan ing lever 4(Fig. 3) which bears on en operating cam 5 preferably cut to e.logarithmic curve so that by a sini le displacement of the cam 5, forinstance, y e milled head 6, the anillo of observation an, Fig. 5 sultended w be lxaropmtionel to a. logarithmic co-eliicient of t e rangeobserved such as, for instance the logarithmic tnnjof the observedangles, which obviously is a function of4 'the logarithm of the range'y, Fig. 5.

Where the observed base is a fixed quan. tity it will be obvious thatthe rangedial reading directly upon onindexv will be suil cient to solvethe problem log of the ohserved base-log tan of the observed angle: logof the range.

Where however it is de' of varying length it. will desirable that therange dial should won irectly in coperation with one side of a.logarithmic scale, the other side of which will coperatie with elleading index eo that the trigonometric problem is stilldirectlysolvnble. As shown in Fig. 3 the milled head 6 b which the dieitouseabase placement of the sighted e ement throuh s index operative onthe other scale, u pin on said index, a base, pivotal means supportingsaid body on said base, a. cam cutI to a co-Sine curve mounted on saidbase, and means to guide said pin alon` said cani when the body is swungon said use to view any object above the horizontal plane containing theinstrument.

10. A telemeter comprising a sighting ele ment, a body carrying saidelement, a cam adapted to displace said sighting element Ill. Atelenieter comprising a sighting ele-V ment,- a oase or body carryingsaid element, an indicator 'to normally indicate the displacement of thesighting element relatively' the object sighted, means interposedbetween said indicator and said sighting element "so correct theindication to a range in a horizontal plane containing the instrument,whenever the sighting plane is dcviated from said horizontal plane, aframe, and

A-means to rotate said body about said frame in said horizontal plane.

12. A teleineter comprising a sighting element, a base nr body carryingsaid clement, a pair of logaritlunic scales, means to conneet one ofsaid scales to the sighting element, on index operative on the otherscale, a com cut to a co-sine curve, operating un snid index to displaceit relatively to said scale to correct the. reading to the correspondingrange of the observed point'in a horizontal piane containing theinstrument, :1 frame, and means to rotate said body about said rnme insaid horizontal plane.

i3. A tolemeter comprising a sighting element, a body carrying saidelement, a pair of logarithmic scales, means to connect one ot saidscales to the sighting element, an index operative on the other scale,o, pin on said index, a base, pivotal means supporting seid body on saidbase, a cam cut to a co-sino curve mounted on said base,means to guidesaid pin alone said cam when the bodyy is swung on sait base, aframe,vand means to rotate said body about said frame in a horizontalplane containing the instrument.

1l. A telemeter c omprisinr a sighting ele ment7 a body carrying said eement, an indi outorto normally indicate the displacement of saidelement relatively to the body when viewing an object above azimuth, abuse, pivotal means supporting said body on said base, a cam mounted onsaid buse, means connecting said cam and said indicator to adjust itsreading according to the displacei'nent. of said body about the cam onthe brise whenover the object. viewed lies above the horizontal planecontaining the instrument, and rack and pinion means to displace saidbod)a accurately about said base.

15. A teleineter comprising a, sighting element, a base or body carryingsaid element, an indicator to normally indicate the displacement o-f thesighting. element relatively to the base or body in termsv of the rangeot' the object sighted, means interposed between said indicator and:said sighting element to correct the indication to a rango in a.horizontal plane containing the instrument whenever the sighting planeis donated from said horizontal plane, und means to deviate the Line oi'sight through said sight ing element through an angle.

16. A teleruetcr comprising a sighting elcment, a-base or body carryingsaid element, an indicator to normally indica-te the dien placement ofthe sighting element relatively to the base or body in terms of the rsnge of the object sighted. means interposed between said indicator andsaid sighting element to correct the indication to :i range in ahorizontal plane containing,r the instrument Whenever the. sightingplane is dcviateti.

from said horizontal plane, and n panca-atie eyepiece in the. line ofsight of said sighting element. c

In nitncos whereof, we have hereunto signed our names this '120th :layof October 1915, in the presence of tivo subscribing wic- Lc-sses.

ALFRED TAYLOR.

ERCY XVILLIS GRAY.

lVitnesses ALFRED Pnoc'rizn, CHARLES Don'xr, Jr.

Cugia: o! this patent may ie'obtained' for five cents each. byadd/teasing inc. faaminloner of Rote-nts Washington, D. C."

